I run OpenBSD on most of my systems. The OpenBSD development team collaborates using cvs instead of git because it fits their workflow well. If I wanted to collaborate with them, I'd use cvs too – and if I wanted to move them to git I'd do it after becoming a core contributor, not before. If I'm going to send bug reports & patches here and there, I'm going to do it in a way that makes it easy for Theo and team to review.

This is very much a Chesterton's fence topic, I think. Linux developers have settled on a workflow that works for them, and if you want to get time from the people who are doing the bulk of the work it's fair to expect you to work within their requests.

you're wrong. instead you should adopt the standards of the group you're attempting to join. Getting "tourist who complains about customs of country they visit" vibes from this comment

It’s a gitlab link, not github. And it isn’t reasonable in this context. GitHub hosts a lot of open source projects but it is not the only place where open source happens. That's kinda the point of open source, and especially of git.

Git itself is a satellite project of the Linux kernel. It can work without the web at all. That someone EEE’d it so hard that even Microsoft couldn’t resist is no reason to expect the kernel devs to change their workflow.